<template>
  <el-container class="home-container">
    <!--头部区域-->
    <el-header>
      <div>
        <img src="../assets/heima.png">
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!--页面主体区域-->
    <el-container>
      <!--侧边栏-->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <!--菜单折叠与展开-->
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!--侧边栏菜单区域 -->
        <el-menu background-color="#373D41" text-color="#fff" unique-opened :collapse="isCollapse"
                 :collapse-transition="false" :router="true" :default-active="activePath">
          <!--一级菜单 -->
          <el-submenu :index="item.id+''" v-for="item in menuList" :key="item.id">
            <!--一级菜单模板区域 -->
            <template slot="title">
              <!--一级菜单中的图标 -->
              <i :class="iconObj[item.id]"></i>
              <!--一级菜单中的文本 -->
              <span>{{ item.authName }}</span>
            </template>
            <!--二级菜单 -->
            <el-menu-item :index="'/' + subItem.path" v-for="subItem in item.children" :key="subItem.id"
                          @click="saveNavStates('/' + subItem.path)">
              <!--二级菜单模板区域 -->
              <template slot="title">
                <!--二级菜单中的图标 -->
                <i class="el-icon-menu"></i>
                <!--二级菜单中的文本 -->
                <span>{{ subItem.authName }}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!--右侧内容主体区域-->
      <el-main>
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>

</template>

<script>
export default {
  name: 'Home',
  data () {
    return {
      //  左侧菜单数据
      menuList: [],
      iconObj: {
        125: 'iconfont icon-users',
        103: 'iconfont icon-tijikongjian',
        101: 'iconfont icon-shangpin',
        102: 'iconfont icon-danju',
        145: 'iconfont icon-baobiao'
      },
      //  是否折叠
      isCollapse: false,
      //  被激活的链接地址
      activePath: ''
    }
  },
  created () {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout () {
      //  清空token
      window.sessionStorage.clear()
      //  跳转到登录页
      this.$router.push('/login')
    },
    //  获取所有的请求
    async getMenuList () {
      //  解构赋值
      const { data: res } = await this.$http.get('menus')
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      } else {
        //  赋值
        this.menuList = res.data
      }
      console.log(res)
    },
    //  点击按钮切换菜单的展开与折叠
    toggleCollapse () {
      this.isCollapse = !this.isCollapse
    },
    //  点击二级菜单保存导航链接激活状态
    saveNavStates (activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>
.home-container{
  height: 100%;
}

.el-header{
  background-color: #373D41;
  display: flex;
  justify-content: space-between;
  /*按钮上下居中*/
  align-items: center;
  color: #fff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    span{
      margin-left: 15px;
    }
  }
}

.el-aside{
  background-color: #333744;
  /*菜单区域*/
  .el-menu{
    border-right: none;
  }
}

.el-main{
  background-color: #EAEDF1;
}

.iconfont{
  margin-right: 10px;
}

/*折叠与展开按钮*/
.toggle-button{
  background-color: #4A5064;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  /*字体加间距*/
  letter-spacing: 0.2em;
  /*鼠标放上去变小手*/
  cursor: pointer;
}
</style>
